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Finding the Fourth Proportional to 99.43, 137.09 and 66.62

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Solution

The fourth proportional to 99.43, 137.09 and 66.62 is: 91.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.43 : 137.09 = 66.62 : x
  2. Step 2: Convert to fraction form
    99.43/137.09 = 66.62/x
  3. Step 3: Cross multiply
    99.43x = 137.09 × 66.62
  4. Step 4: Simplify right side
    99.43x = 9,133.45
  5. Step 5: Solve for x
    x = 9,133.45/99.43
  6. Step 6: Final answer
    x = 91.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.